[llvm] [DAG] Support saturated truncate (PR #99418)

[David Green via llvm-commits]

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@@ -804,6 +804,9 @@ enum NodeType {
 
   /// TRUNCATE - Completely drop the high bits.
   TRUNCATE,
+  /// TRUNCATE_[SU]SAT - Truncate for saturated operand
+  TRUNCATE_SSAT,
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davemgreen wrote:

AArch64 has a SQXTUN node too: https://docsmirror.github.io/A64/2023-09/sqxtun_advsimd.html

https://github.com/llvm/llvm-project/pull/99418